WK 5: Skin Functions and Structure

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What is the characteristic of thin skin?

It lacks hair and sebaceous glands

It has a thick layer of keratinocytes

It is found only on the face

It usually contains hair (correct)

Which cell type is responsible for skin pigmentation?

Melanocytes (correct)

Langerhans cells

Keratinocytes

Merkel cells

What is the main cause of Squamous Cell Carcinoma?

Hormonal imbalance

Viral infection

Genetic mutation

Chronic sun exposure (correct)

Which of the following is NOT a function of skin?

Digestion Signup and view all the answers

What is the outermost layer of the skin?

Epidermis Signup and view all the answers

What type of cancer arises in pigment cells of the skin?

Melanoma Signup and view all the answers

Where is thick skin typically found?

Palms and soles of feet Signup and view all the answers

What is the function of sebum, a secretion of sebaceous glands?

To waterproof skin Signup and view all the answers

What type of secretion do sebaceous glands produce?

Holocrine Signup and view all the answers

Where are sebaceous glands most numerous?

On the face, scalp, forehead, and upper thorax Signup and view all the answers

What is a common skin condition that usually begins in adolescence?

Acne vulgaris Signup and view all the answers

What is the thinnest part of the dermis?

Papillary layer Signup and view all the answers

What type of cancer is the most common in Australians under fifty years of age?

Melanoma Signup and view all the answers

What is the thickness of the dermis in the palms and soles of the feet?

~3mm Signup and view all the answers

What is the primary function of eccrine sweat glands?

Regulating body temperature through thermoregulation Signup and view all the answers

Where are apocrine glands typically located in the body?

Primarily in the axilla, anal region, and areola of nipple Signup and view all the answers

What type of cells form a margin around the secretory units of eccrine glands?

Myoepithelial cells Signup and view all the answers

What is the composition of sweat initially secreted by eccrine glands?

Water, sodium, and potassium ions Signup and view all the answers

What happens to the ions in sweat as it reaches the surface of the skin?

They are absorbed by the epithelial lining Signup and view all the answers

What is the characteristic of the secretion produced by apocrine glands?

It is viscous and odourless Signup and view all the answers

Where are eccrine glands most abundant in the body?

Primarily on the forehead, axillae, palms, and soles Signup and view all the answers

What triggers the sebaceous glands to produce more sebum?

Hormonal changes during puberty Signup and view all the answers

What is the main cause of acne vulgaris?

Hormonal imbalance Signup and view all the answers

What blocks the hair follicle and leads to acne?

Dead skin cells Signup and view all the answers

What contributes to the inflammation in acne?

Bacteria accumulation Signup and view all the answers

What happens to the sebaceous glands during puberty?

They respond to androgens by producing more sebum Signup and view all the answers

What is the result of the skin cells not being shed normally?

Whitehead formation Signup and view all the answers

What is the role of stress in acne development?

It increases androgen production Signup and view all the answers

What is the term for the plug that forms in the hair follicle?

Comedone Signup and view all the answers

What is the genetic contribution to acne development?

Hereditary factors contribute, but the exact mechanism is unknown Signup and view all the answers